Improvement in clamp



JACOB S. LADOW, OF MECHANICSVILLE, NEW YORK.

Letters Pate-nt No. 99,212, dated January 25, 1870.

IMPROVEMENT IN CLAMP.

The Schedule referred to in these Letters Patent and makingv part ot ther-same.

. To all whom it may concern Be it known that I, JACOB S. LADow, of Meehanicsville, in the county of Saratoga, and State of- New York, have invented certain new and improved Clamping-Devices; and I do hereby declare the following to be a full, clear, and exact description thereof, sufficient j to enable others skilled iu the art to which my invention appertains, to make and use the/ same, reference being had to the accompanying drawings, making part of this specification, in which- Figure lis a top or plan view, a portion thereof being broken away.

Figure 2 is a detached view.

Similar letters of referenceindicate corresponding parts. in the two iigures.

My invention consists in a clamping-device, in which adj nsting-screws are arranged with sliding pieces, o n which is placed the movable bed-plate, so that the means for clampingmay be quickly andeasily adjusted.

In the drawings'- A represents the fra lne-work, which may be of usual form and construction.

In the upper side of thisv frame-work there are mounted sliding strips, B, which are adapted to have a uniform transverse movement, and carry with them a bed-piece-or strip, C, whiclrcorresponds with a stationary strip, D, secured to the top oi the flame-work.

A transverse movement is given to the strips 1?l by means of toggle-levers E, connected to a treadle, F, which is pivoted to the lower portion ofthe tramework A. One end of each toggle is pivoted to the frame-work, and the other end is pivoted to forward ends ofthe sliding strips.

It will be perceived, that when the treadle is raised or lowered, the bed-pieces C D will advance to or recede from each other, whereby, when they are open, and a sash, blind, or door, or other frame, is placed on the bed, and resting on the clamps G, andthe treadle be lowered, the aforesaid frame will be firmly pressed together, and thus clamped.

VIn order to adjust the bed-pieces to various sizes'of frames, I employ screw-rods H, and arrange them transversely with the trame-work A.

, .lheir ends are journaled in lugs or bearings J, ou

the ends of the sliding strips B, and the threaded portion passes through projections or lugs Z, ou the bed-piece or strip C. Y In order to communicate motion to the screw-rods H, bevel-wheels, K K, are connected to each of one of their ends, and said wheels mesh with similar wheels secured to a sha-ft, L, to which is connected a crankhandle, M, for operating-purposes.

It will be seen that when the screw is rotated, the bed-piece C is made to slide independently of the Vsliding pieces B, but that when the treadle F is operated, the bed-piece C, sliding pieces B, and screws move together.

The object of such features is as follows:

Suppose a three-feet door or sash-frame is to be clamped, it will be necessary that the distance between the points y, of the clamps G, on the movable and stationary bed-pieces, should likewise be three feet. Should such distance be greater or less, then the screws H must correspondingly adjust it.

Now, a-s it is evident 'that the sash or door-frame could not yet be received between the clamps, it is necessary that the bed-pieces C D be opened, or made to recede from each other. For this purpose, the treadle is raised, whereby the toggle-levers are opened, andthe strips B, and bed-pieces C are drawn backward. In this position, the sash or door-frame is readily introduced between` the clamps G, and then quickly clamped, by depressing the treadle.

' It will be perceived that when the sliding pieces, screws, and bed-piece C recede, the bevel-wheels K are thrown out of gear from the wheels 'on the shaft L. In order to assist inthrowing them into gear again, I may so mount said shaft L as to have a longitudinal motion, whereby the wheels may be readily made to interlock. l

Another advantage in the sliding motion of the shaft is, thatwhen the distance between the beds C D is adjusted, it is not necessary that the bevel-gear should mesh with each other; therefore the wheels on the shaft are moved out of the way of those on the screw-heads. A further advantage is, that when the beds are adjusted, the accidental rotation of the screws is prevented, so vlong as the gearing does not mesh.

N represents the ordinary handclamp,.which is arranged, transversely, on notched blocks O, so that the clamp may always be placed at the middle of the doorsash or other frame which is to be clamped. The sliding shaft-L may be prevented from uniutentional movement by means of a block, P, which is lhinged to the frame-work, so as `to fall behind one of'.

the bevel-wheels on said shaft.

A clamping-device, having the characteristics stated, is simple, practical, and useful.

Having thus describedmy invention,

XV hat I claim as new, and desire to secure by Letters Patent, is-

1. The improved clamping-device, constructed a-nd operating as herein described. l

2. The screws H, operated simultaneously, in combination with the sliding pieces B, sliding bed-plate C, and stationary bed-plate D, substantially as and for the purpose described.

The above signed by me, this 16th day of November, 1869.

JACOB S. LADOW.

Witnesses JOHN A. WIEDnRsHEIM, OnvrLLn D. VAUGHN. 

